View online: https://www.drupal.org/sa-contrib-2026-192 Project: Block AJAX [1] Project machine name: block_ajax Date: 2026-October-07 Security risk: *Critical* 18 ∕ 25 AC:Basic/A:None/CI:Some/II:All/E:Theoretical/TD:All [2] Vulnerability: PHP object injection Affected versions: <3.0.2 CVE IDs: CVE-2026-107249 Description: The Block AJAX module enables you to load blocks asynchronously via Ajax. The module doesn't sufficiently validate user-supplied data which is used to construct a block. In the worst case scenario, this can lead to PHP Object Injection and Remote Code Execution. The vulnerability is mitigated by the fact that it only affects sites that have Layout Builder enabled (or another block plugin that handles the data this module passes to it in a potentially unsafe way). Please see the release notes for details of potentially breaking changes. Solution: Install the latest version: * If you use the "block_ajax" module, upgrade to block_ajax 3.0.2 [3] Reported By: * Drew Webber (mcdruid) [4] of the Drupal Security Team Fixed By: * Julian Pustkuchen (anybody) [5] * Joshua Sedler (grevil) [6] Coordinated By: * Swan Kalata (akalata) [7] of the Drupal Security Team * Drew Webber (mcdruid) [8] of the Drupal Security Team ------------------------------------------------------------------------------ Contribution record [9] [1] https://www.drupal.org/project/block_ajax [2] https://www.drupal.org/security-team/risk-levels [3] https://www.drupal.org/project/block_ajax/releases/3.0.2 [4] https://www.drupal.org/u/mcdruid [5] https://www.drupal.org/u/anybody [6] https://www.drupal.org/u/grevil [7] https://www.drupal.org/u/akalata [8] https://www.drupal.org/u/mcdruid [9] https://new.drupal.org/contribution-record?source_link=https%3A//www.drupal....